GOCBC-579: Update Ping operation
GOCBC-579: Update Ping operation

Motivation
----------
In order to being in compliance with healthcheck RFC we need to
update the PingResult.

Changes
-------
Add Id and Scope to the PingResult.

Change-Id: I6338f18112b0f2ab9581e992120e53e2bdb8cb0d
Reviewed-on: http://review.couchbase.org/115424
Reviewed-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>
Tested-by: Charles Dixon <e13bf4498b4994e133fd3586350658dc4a59329a@gmail.com>

brett19/gocbcore